热和离心位移对球轴承刚度影响的数值分析

发布时间：2018-01-01 05:09

本文关键词：热和离心位移对球轴承刚度影响的数值分析　出处：《机械设计与制造》2016年04期 　论文类型：期刊论文

【摘要】：针对高速角接触球轴承刚度影响因素多、精确预测困难的特点,基于拟静力学模型考虑了离心力、陀螺力矩、轴承套圈热变形和内套圈离心膨胀等多种因素影响,计算了轴承动态刚度,分析了工况和结构参数对轴承动态刚度的影响。分析结果表明:热和离心效应使轴承轴向刚减小,径向刚度增加,对轴承动刚度影响不容忽视;轴向和径向刚度随轴向载荷增加而增大,随径向载荷增加而减小;不考虑热和离心效应时轴向刚度随内沟曲率系数增加而明显减小,考虑热和离心效应时轴向刚度略有增加;轴向和径向刚度随外沟曲率系数增加而减小;转速和球径对轴承刚度影响较复杂,是转速和球径综合作用结果。
[Abstract]:In view of the fact that the stiffness of high speed angular contact ball bearings is affected by many factors and it is difficult to predict accurately, the centrifugal force and gyroscopic moment are considered based on the pseudostatics model. The dynamic stiffness of bearing is calculated by the influence of many factors, such as thermal deformation of bearing ring and centrifugal expansion of inner ring. The effects of working conditions and structural parameters on the dynamic stiffness of bearings are analyzed. The results show that the axial stiffness and radial stiffness of bearings are decreased and radial stiffness is increased due to the thermal and centrifugal effects, which can not be ignored. The axial and radial stiffness increases with the increase of axial load and decreases with the increase of radial load. The axial stiffness decreases obviously with the increase of the curvature coefficient of the inner groove when the heat and centrifugal effects are not taken into account, and the axial stiffness increases slightly when the heat and centrifugal effects are taken into account. The axial and radial stiffness decrease with the increase of the curvature coefficient. The influence of rotational speed and ball diameter on bearing stiffness is complex, which is the result of the combined effect of rotational speed and ball diameter.
【作者单位】：西安交通大学机械工程学院;
【基金】：国家自然科学基金项目(51175410) 河南煤化基础重大科研项目(2011LYC01-01)
【分类号】：TH133.3
【正文快照】： 1引言滚动轴承具有摩擦阻力小、传动效率高、结构紧凑等优点,广泛应用于机床主轴等高速转子系统。目前,高速电主轴主要采用角接触轴承作为支承,支承刚度直接影响着机床主轴临界转速、结构振动等动力学特性和机床加工精度[1-4],因此更精确、接近实际地预测轴承动态刚度具有重要

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